208 THE HOUSE FLY— DISEASE CARRIER 



water with a film of kerosene on top in an ordinary 

 unprotected tub, pail, or barrel system is that if the 

 water is too deep splashing occurs, and a wet system 

 calls for a large receptacle. 



In a recent publication, Stiles ( 1910) covers the whole 

 subject, and gives directions for building a really sani- 

 tary privy, indicating that any fourteen-year-old school- 

 boy of average intelligence in mechanical engineering 

 could, by following the plans given, build a sanitary 

 privy for his home at an expense for building materials, 

 exclusive of receptacle, of from five to ten dollars, ac- 

 cording to locality. The plan (directions for its con- 

 struction are printed as Appendix IV) provides for a 

 fly-proof structure, well ventilated, with a receptacle 

 for the excreta mounted on a floor and protected from 

 behind by a hinged door through which it can be re- 

 moved. The receptacle always contains the necessary 

 amount of water with a film of kerosene floating on it. 

 The most casual observation will indicate when to re- 

 new the water and kerosene and when to empty the 

 receptacle. 



Since the publication of the bulletin in question, 

 Lumsden, Roberts, and Stiles, of the Public Health 

 Service, have devised an additional arrangement which 

 they have had in constant use in the Hygienic Labora- 

 tory at Washington for several months. Concerning 

 the practical workings of this apparatus they seem 

 very enthusiastic. The writer himself has visited it 

 and found it perfectly unobjectionable after being in 

 use for more than three months without having been 



